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Application of poly(p-phenylenevinylene)conjugated polymer fluorescent nanomaterials in latent fingerprint visualization

A technology of phenylene vinylene and fluorescent nanomaterials, which is applied in the fields of fluorescence/phosphorescence, material excitation analysis, etc., to achieve remarkable developing effect and simple operation

Active Publication Date: 2019-09-17
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its application to reveal latent fingerprints on adhesive surfaces has not been reported so far.

Method used

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  • Application of poly(p-phenylenevinylene)conjugated polymer fluorescent nanomaterials in latent fingerprint visualization
  • Application of poly(p-phenylenevinylene)conjugated polymer fluorescent nanomaterials in latent fingerprint visualization
  • Application of poly(p-phenylenevinylene)conjugated polymer fluorescent nanomaterials in latent fingerprint visualization

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This embodiment provides a method for developing fresh latent fingerprints on the adhesive surface of fingerprint tape with polymer fluorescent nanoparticle suspension, the specific steps are as follows:

[0026] 1. According to the technical scheme disclosed in the Chinese invention patent (CN104845052A), the poly(p-phenylene vinylene) precursor solution (pre-PPV) was prepared. Take 5 mL of the prepared pre-PPV and put it into a two-necked flask under anaerobic conditions, add 15 mL of deionized water to dilute, add 0.2003 g of sodium dodecylsulfonate SDS (0.0007 mol), raise the temperature to 50 °C, and wait for Sodium dodecylsulfonate was completely dissolved, and then 0.2 mL of triethylamine (0.0014 mol) was added as an elimination reaction catalyst, and the temperature was continued to 80 °C, and the reaction was continued for 3 h to obtain 18 mL of PPV nanoparticle suspension.

[0027] 2. Take 1 mL of the suspension prepared in step 1, add 4 mL of deionized water ...

Embodiment 2

[0035] 1. According to the technical scheme disclosed in the Chinese invention patent (CN104845052A), prepare poly-p-phenylene vinylene precursor solution (pre-PPV), take 5 mL into a 50 mL two-necked flask under anaerobic conditions, and then add 15 mL to Dilute with deionized water, add 0.2003 g sodium dodecylsulfonate SDS (0.0007 mol) to it, raise the temperature to 50°C to completely dissolve the SDS, then add 0.2 mL triethylamine (0.0014 mol) as a catalyst for the elimination reaction, and continue to raise the temperature To 80 ℃, continue stirring for 3 h to obtain 18 mL of PPV nanoparticle suspension; take 1 mL of the suspension, add 4 mL of deionized water to dilute to obtain a volume of 5 mL of developer, put it in a weighing bottle for later use .

[0036] 2. Store the fingerprint tape loaded with fingerprints at room temperature for 30 days, and then immerse in the developer solution for 5-10 minutes to ensure full contact between fingerprints and nanoparticles.

...

Embodiment 3

[0041] 1. According to the technical scheme disclosed in the Chinese invention patent (CN104845052A), the poly-p-phenylene vinylene precursor solution (pre-PPV) was prepared, and the reaction system was kept in an oxygen-free environment, and 5 mL of the precursor solution was added to 50 mL of Add 15 mL of deionized water to the two-necked flask for dilution, add 0.2003 g of sodium dodecylsulfonate SDS (0.0007 mol), raise the temperature to 50°C to completely dissolve the SDS, and then add 0.2 mL of triethylamine (0.0014 mol) As a catalyst for the elimination reaction, continue to heat up to 80 °C, and continue to stir for 3 h to obtain 18 mL of PPV nanoparticle suspension; take 1 mL of the suspension, add 4 mL of deionized water for dilution, and obtain a volume of 5 mL of developing solution, set Reserve in a weighing bottle.

[0042] 2. Completely immerse the yellow sealing tape with fresh fingerprints in the developer solution for 5-10 minutes to ensure full contact betwe...

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Abstract

The invention discloses the application of a poly(p-phenylenevinylene) conjugated polymer fluorescent nanomaterial in latent fingerprint visualization, and in particular relates to a method for developing latent fingerprints on the sticky surface of an adhesive tape, which belongs to the trace detection technology field. The PPV precursor solution prepared by the Wessling sulfonium salt precursor method is self-assembled to form a PPV fluorescent nanoparticle solution by adding the surfactant sodium dodecylsulfonate during the heat elimination process; the adhesive tape with latent fingerprints is directly Immerse in the nanoparticle solution for developing treatment, take it out, rinse with deionized water, and dry, and you can observe bright fingerprint lines under 365 nm ultraviolet light, which is suitable for photographing and recording. The method for revealing latent fingerprints on the sticky side of the tape provided by the invention has good developing effect, convenient operation and short developing time, and can develop latent fingerprints on the sticky side of different tapes; and the developer is an aqueous dispersion, non-toxic and reusable.

Description

technical field [0001] The invention relates to a method for developing latent fingerprints by polymer fluorescent nanomaterials, in particular to a method for developing latent fingerprints on the sticky surface of an adhesive tape, which belongs to the technical field of trace detection. Background technique [0002] For a long time, fingerprint recognition technology has been paid great attention to by researchers as a biometric technology, especially for the display of latent fingerprints. Latent fingerprints are different from obvious lines and forming lines. They are invisible to the naked eye, but they are the most common type of fingerprints at crime scenes. Therefore, the display of such fingerprints has become the most basic work of fingerprint workers. At present, there are many methods for developing latent fingerprints, such as powder method, 502 fumigation method, ninhydrin dyeing method and vacuum coating method, etc., but these methods are difficult to achiev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/64
Inventor 范丽娟陈红马荣梁
Owner SUZHOU UNIV
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